Resource Saving Treatment of Wastepaper Mass Recycling Residuals

Abstract

The process of residuals formation in wastepaper mass treatment processes is analyzed. It is established that the main residuals flows are the waste of synthetic polymers forming at the stage of wastepaper preparation and purification as well as wash water of fiber and starch forming at the formation stage of the paper sheet, during ingress of which into the industrial wastewater, the pulp and paper sludge is formed due to the biochemical purification. A model of solution acceptance based on best available technology (BAT) principles is presented. Based on the proposed model, an ecologically oriented complex of technical solutions is developed. The formation of wastewater with high fiber and starch content is minimized by 20% on average due to the application of retention system of fiber and starch in the paper sheet. The resource and energetic potential of the pulp and paper sludge formed due to the purification of wastewater is used by means of its partial recirculation in the production process, thermal neutralization with heat production, or application as the burning additive when producing the ceramic bricks. The resource and energetic potential of wastepaper mass preparation residuals is used by means of pyrolysis with the formation of the pyrolysis fuel mixture (the yield of about 40%), technical carbon (the yield of about 10%), and insignificant amount of metallic inclusions subjected to recycling. Approaches presented in the article can be used when developing the resource-saving technological schemes of handling the waste for productions applying the wastepaper as the feedstock for the fabrication of the commercial product.